Journal of
Environmental Chemistry and Ecotoxicology

  • Abbreviation: J. Environ. Chem. Ecotoxicol.
  • Language: English
  • ISSN: 2141-226X
  • DOI: 10.5897/JECE
  • Start Year: 2009
  • Published Articles: 197

Full Length Research Paper

Haematological, biological and behavioural changes in Oreochromis niloticus (Linne 1757) juveniles exposed to Paraquat herbicide

Fidelis Bekeh Ada1, Edet Ekpenyong2 and Ezekiel O. Ayotunde1
  1Department of Fisheries and Aquatic Sciences, Faculty of Agriculture and Forestry, Cross River University of Technology, Obubra Campus, Nigeria. 2Department of Zoology and Environmental Biology, Faculty of Science, University of Calabar, Nigeria.
Email: [email protected]

  •  Accepted: 08 December 2011
  •  Published: 22 February 2012



The Nile Tilapia, Oreochromis niloticus was exposed to Paraquat for 24 h so as to monitor its effects on the fish’s haematology, and general behaviours. The haematological parameters estimated include haemoglobin, mean cell haemoglobin, mean cell haemoglobin concentration, packed cell volume, mean cell volume, erythrocyte sedimentation rate and white and red blood cell counts. The hepatosomatic index was measured for different concentrations of Paraquat exposed. Results showed that the hepatosomatic index was decreasing with increasing concentration of Paraquat. Haemoglobin, mean cell haemoglobin, mean cell haemoglobin concentration and erythrocyte sedimentation rate were observed to be negatively related to concentration of Paraquat. Packed cell volume, white blood cell count (WBC), red blood cell count (RBC) showed positive relationship with concentration while mean cell volume was not significantly changing with change in concentration of Paraquat.


Key words: Oreochromis niloticus, Paraquat, herbicide, haematology, hepatosomatic, index, biological responses.